Valve stem clearance jig



Jan. 18, 1938 D POINTER 2,105,502

VALVE STEM CLEARANCE JIG Filed Oct. 8, 1956 2 Sheets- Sheet l ,Delberi.Poz'n izer NVENTOR ATTORNEYS Jan.

D. POINTER 2,105,502 VALVE STEM CLEARANCE JIG Filed Oct. s, 1956 2Sheets-Sheet 2 l6 Zy 5.

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ATTORNEYS Patented Jan. 18, 1938 PATENT QFFICE VALVE STEM CLEARANCE JIGDelbert Pointer, Farmer City, 111.

Application October 8, 1936, Serial No. 104,737

2 Claims.

This invention relates to a valve stem clearance jig and has for theprimary object the provision of a portable and inexpensive device ofthis character which will materially aid in accurately grinding valvesof an engine to fit the valve mechanism adjustment of said engine withproper clearance, eliminating the necessity of adjusting the valvemechanism of the engine after the valve grinding operation and is easilyadjusted to the valve mechanism adjustments of different engines.

With these and other objects in view, this invention consists in certainnovel features of construction, combination and arrangement of partstobe hereinafter more fully described and claimed.

For a complete understanding of my invention, reference is to be had tothe following description and accompanying drawings, in which Figure 1is a side elevation illustrating a valve stem clearance jig constructedin accordance with my invention.

Figure 2 is top plan view partly in section illustrating the same.

Figure 3 is a transverse sectional view taken on the line 3-3 or Figure1.

Figure 4 is a fragmentary end view illustrating the jig.

Figure 5 is a vertical sectional view showing a valve adapted to thejig.

Figure 6 a detail sectional view showing the means of adjustablymounting the gage on the jig.

Figure 7 is a fragmentary sectional view showing a gage setting toolassociated with the jig head.

Figure 8 is a fragmentary vertical sectional view illustrating anothertype of gage setting tool associated with the jig head.

Referring in detail to the drawings, the numeral I indicates in itsentirety a jig consisting of a vertically arranged post 2 supported by abase 3. The post has an opening 4 and aligning with said opening andforming an integral part of the post and arranged horizontally is a seat5 of substantially V shape in cross section. The seat 5 has an extension6 integral therewith to form a support for a gage I of a conventionalconstruction including the usual actuating plunger 8. The gage 1 is ofthe rim set type so that the dial can be adjusted relative to theindicating hand of the gage. The gage is adjustable endwise of theextension 6 and towards and RElSSUE from the seat 5 and is easilysecured in its adjusted positions by set screws 9.

A jig head If! is slidably mounted on the post 2 and is arranged on anopposite side of the post from the seat 5 and is capable of adjustmentupwardly and downwardly on the post, the latter having a suitable scaleII to facilitate the ad'- justment of the head with respect to the seat5. The head It! consists of a cylindrical body l2 slidably andadjustably secured to the post 2 by set bolts l3 threaded in the bodyand equipped with collars l4 engaging the post. The body I2 is grooved,as shown at l5, to receive the post and cooperate with the collars inslidably connecting the body to the post. The body has a bore l6therethrough and one end of the body is shaped to form a seat IT. Theseat is shaped in accordance with the shape of a valve seat of anengine. In order that this jig may be employed with difierent engines itwill be necessary to have heads with the seats thereof in accordancewith the valve seats of the different engines so that when using the jigthe proper head for a particular engine will be adapted to the post 2.The seat I! of the head is in communication with the bore I6 and thelatter with the opening in the post and as the head is adjustable on thepost the seat I! may be readily centered with respect to the seat 5 sothat when a valve of an engine is adapted or placed in the jig the headof the valve will engage the seat I! evenly with the stem of the valvesupported by the seat 5, as shown in Figure 5. The head of the valvewhen in engagement with the seat I! contacts the plunger 8 of the gageto move the indicator hand of the gage with respect to the scale or dialreadings.

In order to adjust the jig described for grinding a valve stem of avalve of an engine to have the proper clearance, a gage setting tool isemployed. This tool is now in use and forms no part of the presentinvention. There are several forms of gage setting tools in order thatsuch tools may be used on the different types of engines now in use. Inorder to illustrate a gage setting tool I have elected to show twoforms, one indicated by the character l8 and the other by the characterl9. Each of these forms of gage setting tools consists of a stem 20 anda head 2| slidable on the stem and held in various adjusted positions bya set bolt 22. The head in both forms has a portion shaped in accordancewith a valve head, as shown at 23. The form of gage setting toolindicated by the character l8 has an extension 24 integral with the head2| and of a diameter equal to the exterior diameter of a valve guide ofan engine. In order to remove certain types of valves from engines it isnecessary to remove the valve guide and when using a gage setting toolon the engine with the valve guide removed, the form indicated by thecharacter I8 is employed so that 'the extension 24 will fit against thewalls of the cylinder block which engage with the valve guide so thatwhen the gage setting tool is placed in engagement with the valve seatof. the engine and; the stem 20 engaging with the valve lifter of theengine the gage setting tool will be held against accidental movement.

For the type of valve which can. be removed from an engine withoutremoval of the valve guide, the gage setting tool I9 is employed forobtaining the exact distance between the valve seat of the engine andthe valve lifter. This is accomplished by bringing the stem 20 inengagement with the valve lifter and adjusting the head of the gage.setting tool against the valve seat; The head of the gage setting toolis then locked to the stem 20 by the set bolt 22. The gage setting toolis then removed from the engine and placed in the jig with the headthereof inengagement with the seat H and the stem 28' to have properclearance when the valve is assembled in the engine, said valve ispositioned in the jig with the head of the valve against the seat I! andthe stem of the valve against the plunger 8 actuating the gage so thatthe operator may determine exactly the length which the valve stem mustbe in order to have the proper valve clearance for the engine. Theoperator then proceeds to grind off the valve stem until said stem isthe proper length. to provide for the necessary valveclearance; Duringthe: grinding of the stem of the valve the operator can at any time byplacing the valve in the jig ascertain how much more of the stem. shouldbe removed in order to make the stem of the proper length.

Havingdescribed the invention, I claim:

t 1. A valve stem clearance ig comprising a vertically arranged posthaving. an opening, a horizontally disposed valve stem rest carried bysaid post, meanstfor supporting thegage. onzsaid rest, and a jig headslidably supported on the post including a body having a bore and a seattobe engaged by a valve head with the stem supported by the rest and inengagement with the gage.

2; A valve stem clearance jig comprising a base, a post carried by saidbase and having an opening, a valve stem restcarried by the. post, an'extension carried by the -rest for adjustably supporting a gage relativeto the rest, a-

jig head adjustably mounted on the post and includinga body having abore, and a seat capable of being centered with respect to the rest bythe adjustment of the head on the post.

, DELBERT POINTER.

